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Characters like %2C would indicate that there are some commas in the URL. Rather than making a 301 redirect rule for each URL, have you considered doing a mod_rewrite rule instead? Granted, I'm no expert on regular expressions, but one or two good mod_rewrites can save you considerable time than doing a 301 rewrite for each URL with encoded characters.

Check out this primer on URL rewriting. It helped me out when I was designing a site in the last few months. Note that it does require a little knowledge on regexes.

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